we are mandated by law. president truman, in 1948, declared that fort mchenry should fly the flag 24/7, 365 days. >> like our country, our flag has changed a lot through the years. how long has the flag looked the way it does? >> the flag has had 50 stars and 13 stripes since 1960. >> that's when hawaii became our newest state. what is the most-famous american flag? >> the most-famous american flag is the flag that flew here in 1814. it is now in the smithsonian museum in washington, but it inspired the national anthem, and, therefore, it is the most-famous american flag. >> flag had 15 stars and 15 stripes, and if you look closely, the flag they are flying here at fort mchenry is the same -- just a lot smaller. what are the right ways to handle the flag? >> the proper way is to not let it touch the ground, to bring the flag down slowly and reverently, but to hoist it briskly and with enthusiasm, especially in carrying the flag, they carry it close to your heart with your hands crisscrossed, and just showing